To improve the credibility of protection reliability assessment results affected by the lack of basic data accumulation and mining, statistical analysis software of protection reliability basic data is designed and accomplished based on the characteristics of protection systems. Basic data is analyzed from different aspects. Statistical calculation, regression analysis of failure rate function and short-term forecast of device reliability are accomplished based on data preprocess. The analysis results could supply reference for assessing protection reliability and deciding reasonable maintenance strategy, and have positive effects on further promoting the reliability operating level of protection systems.