diff --git a/README.en.md b/README.en.md
index ca21db2..51e3edf 100644
--- a/README.en.md
+++ b/README.en.md
@@ -6,21 +6,22 @@ This package contains a recent version of the Kinematics and Dynamics Library (K
 #### Software Architecture
 Software architecture description
 
+Orocos project to supply RealTime usable kinematics and dynamics code,it contains code for rigid body kinematics calculations and
+representations for kinematic structures and their inverse and forward kinematic solvers.
+
 #### Installation
 
 1.  Dowload RPM
-http://117.78.1.88/package/binary/download/home:darwin7788:branches:openEuler:20.09/orocos_kdl/standard_aarch64/aarch64/orocos_kdl-1.4.0-0.oe1.aarch64.rpm
+wget http://121.36.3.168:82/home:/davidhan:/branches:/openEuler:/20.09/standard_aarch64/aarch64//orocos_kdl-1.4.0-0.oe1.aarch64.rpm 
+
 2.  Install RPM
+
 sudo rpm -ivh orocos_kdl-1.4.0-0.oe1.aarch64.rpm
 
 #### Instructions
 
-1. Kinematics and Dynamics Library:
+Exit the orocos_kdl file under the /opt/ros/melodic/devel_isolated/ directory , Prove that the software installation is successful
 
-Orocos project to supply RealTime usable kinematics and dynamics code,
-it contains code for rigid body kinematics calculations and
-representations for kinematic structures and their inverse and forward
-kinematic solvers.
 
 #### Contribution