diff --git a/README.rst b/README.rst
index aaa33a7..383b1cb 100644
--- a/README.rst
+++ b/README.rst
@@ -73,6 +73,7 @@ adafruit_max7219.Matrix8x8 Example
 
       spi = busio.SPI(clk, MOSI=din)
       display = matrices.Matrix8x8(spi, cs)
+      display.rotation(1)    #change display direction
       while True:
           display.brightness(3)
 
@@ -124,3 +125,14 @@ Documentation
 =============
 
 For information on building library documentation, please check out `this guide <https://learn.adafruit.com/creating-and-sharing-a-circuitpython-library/sharing-our-docs-on-readthedocs#sphinx-5-1>`_.
+
+
+Additons
+=============
+
+1. Add rotation func
+
+.. code-block:: python
+
+    matrix = matrices.Matrix8x8(spi, cs)
+    matrix.rotation(2)
diff --git a/adafruit_max7219/matrices.py b/adafruit_max7219/matrices.py
index 955e050..f32c127 100644
--- a/adafruit_max7219/matrices.py
+++ b/adafruit_max7219/matrices.py
@@ -6,9 +6,11 @@
 `adafruit_max7219.matrices.Matrix8x8`
 ====================================================
 """
+import time
 from micropython import const
 from adafruit_max7219 import max7219
 
+
 __version__ = "0.0.0-auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_MAX7219.git"
 
@@ -26,8 +28,8 @@ class Matrix8x8(max7219.MAX7219):
     :param ~digitalio.DigitalInOut cs: digital in/out to use as chip select signal
     """
 
-    def __init__(self, spi, cs):
-        super().__init__(8, 8, spi, cs)
+    def __init__(self, spi, cs, num=1):
+        super().__init__(8, 8, spi, cs, num=num)
 
     def init_display(self):
         for cmd, data in (
@@ -37,7 +39,7 @@ def init_display(self):
             (_DECODEMODE, 0),
             (_SHUTDOWN, 1),
         ):
-            self.write_cmd(cmd, data)
+            self._write([cmd, data] * self.num)
 
         self.fill(0)
         self.show()
@@ -58,3 +60,20 @@ def clear_all(self):
         Clears all matrix leds.
         """
         self.fill(0)
+
+    def display_str(self, data, delay=1):
+        """
+        Display string on led matrix by matrix length
+
+        :param str: string that can be of any length.
+        :param delay: transfer time from one screen to  another screen. default value is 1s
+
+        """
+        i = -1
+        for char in data:
+            i += 1
+            self.fill(0)
+            self.text(char, 1, 0)
+            self.show_char_position(i % self.num)
+            if i % self.num == self.num - 1:
+                time.sleep(delay)
diff --git a/adafruit_max7219/max7219.py b/adafruit_max7219/max7219.py
index b0458f6..a665ed7 100644
--- a/adafruit_max7219/max7219.py
+++ b/adafruit_max7219/max7219.py
@@ -52,6 +52,8 @@
 _DIGIT0 = const(1)
 _INTENSITY = const(10)
 
+MAX7219_REG_NOOP = 0x0
+
 
 class MAX7219:
     """
@@ -66,7 +68,7 @@ class MAX7219:
     """
 
     def __init__(
-        self, width, height, spi, cs, *, baudrate=8000000, polarity=0, phase=0
+        self, width, height, spi, cs, *, baudrate=8000000, polarity=0, phase=0, num=1
     ):
 
         self._chip_select = cs
@@ -81,6 +83,7 @@ def __init__(
 
         self.width = width
         self.height = height
+        self.num = num
 
         self.init_display()
 
@@ -90,6 +93,7 @@ def init_display(self):
     def brightness(self, value):
         """
         Controls the brightness of the display.
+
         :param int value: 0->15 dimmest to brightest
         """
         if not 0 <= value <= 15:
@@ -108,6 +112,7 @@ def show(self, number=1, t_num=1):
     def fill(self, bit_value):
         """
         Fill the display buffer.
+
         :param int bit_value: value > 0 set the buffer bit, else clears the buffer bit
         """
         self.framebuf.fill(bit_value)
@@ -115,6 +120,7 @@ def fill(self, bit_value):
     def pixel(self, xpos, ypos, bit_value=None):
         """
         Set one buffer bit
+
         :param xpos: x position to set bit
         :param ypos: y position to set bit
         :param int bit_value: value > 0 sets the buffer bit, else clears the buffer bit
@@ -153,3 +159,29 @@ def rotation(self, direction):
         :param direction:set int to change display direction, value 0 (default), 1, 2, 3
         """
         self.framebuf.rotation = direction
+
+    def _write(self, data):
+        """
+        Send the bytes (which should comprise of alternating command, data values)
+        over the SPI device.
+
+        :param data: command collections
+        """
+
+        self._chip_select.value = False
+        with self._spi_device as my_spi_device:
+            my_spi_device.write(bytes(data))
+        self._chip_select.value = True
+
+    def show_char_position(self, position=0):
+        """
+        write data to the position that is one of multi led matrix
+
+        :param position: the position of matrix, value begin 0.
+
+        """
+        for ypos in range(8):
+            self._write(
+                [_DIGIT0 + ypos, self._buffer[ypos]]
+                + ([MAX7219_REG_NOOP, 0] * (position))
+            )
diff --git a/examples/max7219_disaplay_string_multi_matrix.py b/examples/max7219_disaplay_string_multi_matrix.py
new file mode 100644
index 0000000..930b49f
--- /dev/null
+++ b/examples/max7219_disaplay_string_multi_matrix.py
@@ -0,0 +1,20 @@
+# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+
+import board
+import busio
+import digitalio
+from adafruit_max7219 import matrices
+
+clk = board.IO4
+din = board.IO2
+cs = digitalio.DigitalInOut(board.IO3)
+
+spi = busio.SPI(clk, MOSI=din)
+display = matrices.Matrix8x8(spi, cs, 4)
+display.framebuf.rotation = 1  # rotate screen
+
+display.clear_all()
+while True:
+    display.display_str("abc7568123456789asdfghj", 2)