Abstract: According to the characteristics and requirements of the software engineering in aerospace,the paper offers the metrics for the quantificational measurement of software source codes,these metrics are based on the Logiscope and McCabe measurement system.There are three newly defined metrics especially for the demand of the current software in aerospace.To evaluate the metrics,the paper gives a general rating model and its calculating method of model parameters.To determine the parameters of each metric rating model,the statistical data of metrics are analyzed through testing different software samples,and the parameters of the metric rating model result from the analysis.The paper indicates the model can efficiently assess the software in aerospace,which will help quality controllers and software designers to assess software quality objectively and improve it.