The seismic performance design of Guangdong local code Technical Specification for Concrete Structures of Tall Building ( DBJ15-92—2013) was improved based on current national earthquake resistant design code． The elements' bearing capacity was designed according to the earthquake force of inter-mediate earthquake and the ductility of elements measured by the capacity utilization factors． First-order Second-moment Method ( FOSM) was employed to verify the reliability of the new earthquake resistant capacity equation． And the influence of many factors，such as the ratio of load ( the ratio of seismic force to gravity) ，performance levels，and precautionary intensity and element types，on the reliability were evaluated． The results show that under the same performance level， the reliability index and the reliable probability of elements conform to the rule: compression members ＞ shear members ＞ flexural members ＞ tension members． This rule satisfies the“strong shear weak bending”design conception． The ratio of load and the index of component importance coefficient have a great impact on the reliability， but the fortification intensity has a small influence．