The vector-valued functions associated with second-order cones have been much studied in solutions methods for second-order-cone programs (SOCPs) and second-order-cone complementarity programs (SOCCPs). In this paper, we study the SOC-convexity for some function , in particular, we derive some characterization of determinant defined on second-order cones (SOCs). Finally, we discuss the SOC-monotonicity for the lagarithmic function which is approached by different analysis .