Abstract: Considering that some technicians have vague understanding in general safety reserve of reinforced concrete structural member, the ratio of the mean value of resistance to the mean value of load effects K is derived for reinforced concrete flexural members and axial compression members, which comes from concepts of mean value, nominal value and design value of load and mean value, nominal value and design value of strength of material. For flexural members, K is about 118~ 213 and for compression members, it is about 211~ 2181 Through analyzing general safety reserve of reinforced concrete structural member, designers will understand that on the one hand they should comply with code in structural design, on the other hand, they should keep their head in case of slight quality issue or slight overload on structures.