Abstract：Typical soft rock has special engineering properties and it is widely distributed in China. How to estimate tip-resistance design values of deep foundation embedded in typical soft rock is a challenging issue in geotechnical engineering. Specification methods by test parameters are discussed；and tip-resistance design values of deep foundation based on Chinese codes，are obtained by multiplying a coefficient less than 1 with frc as the uniaxial compression strength of typical soft rock. Coefficients are of more disparity in different codes. Moreover，design valves in specification underestimate the bearing capacity of soft rock for neglecting effect of some field factors such as confining pressure and rock structure，et al.. Parameters obtained by various test methods，field testing in chief bonding or indoor experiment to determine tip-resistance value are also presented. Advantages and disadvantages of each method are also discussed in different aspects. In the simulative conditions，results from plate load test and pressuremeter test agree well with bearing behavior of pile-tip soft rock in deep foundation to some extent. Tip-resistance value computed by dynamic triaxial test¢s parameters value is more approximate to plate loading test value than that computed by uniaxial compression strength in some cases. Linear relationship using N，the standard penetration test value，to determine tip-resistance value has no enough theoretical foundation. Tip-resistance value computed by frc，c and or N for typical soft rock，is merely referred to as initial design value suggesting by survey department. Conclusively，determination of tip-resistance design value should be dependent mainly on field testing and verified by indoor experiment at the same time. Comparing and analyzing tip-resistance values of typical soft rock in areas，Changsha，Nanjing，Guangzhou，Nanning，show that values in the four regions are different and greater than experimental values and suggested values in Chinese codes，although they are belonging to the same soil category. Determining tip-resistance of soft rock consulting from codes should consider regional differences in view of economics and safety.
