Single-chip is an integrated on a single chip of a complete computer system. In recent years, along with the rapid development of science and technology, single-chip application is to continuously at the same time, traditional control testing with each passing day update. In the real-time detection and automatic control of the single-chip applications, often single-chip, as a core component to the use of only single-chip knowledge is not enough, should also be based on the specific hardware structure, as well as application-specific characteristics of the object Software, to be improved. With the application of single-chip technology development and increase in single-chip industrial measurement and control, smart instrumentation, automotive electronics, household electrical appliances such fields as widely used. Single-chip has been at the core of the control circuit in our daily lives in a wide range of applications. This article has been discussed for the 8051 core control, external digital control, light-emitting diode, keyboard, LCD control hardware to form the multi-functional system board. Single-chip is an integrated on a single chip of a complete computer system. In recent years, along with the rapid development of science and technology, single-chip application is to continuously at the same time, traditional control testing with each passing day update. In the real-time detection and automatic control of the single-chip applications, often single-chip, as a core component to the use of only single-chip knowledge is not enough, should also be based on the specific hardware structure, as well as application-specific characteristics of the object Software, to be improved. With the application of single-chip technology development and increase in single-chip industrial measurement and control, smart instrumentation, automotive electronics, household electrical appliances such fields as widely used. Single-chip has been at the core of the control circuit in our daily lives in a wide range of applications. This article has been discussed for the 8051 core control, external digital control, light-emitting diode, keyboard, LCD control hardware to form the multi-functional system board.