Abstract: The leakage dissipation catches up with the dynamic power consumption gradually and it is becoming an important factor in low-power CMOS circuits. In this work, a p-type complementary pass-transistor adiabatic logic (P-CPAL) using DTCMOS and gate-length biasing techniques is proposed. In order to reduce sub-threshold leakage dissipations, DTCMOS and gate-length biasing techniques are used for the P-CPAL circuits. An ISCAS benchmark circuit using DTCMOS and gate-length biasing techniques is verified. All circuits are simulated with HSPICE using a NCSU 65nm PTM (Predictive Technology Model) process. Results show that both leakage and dynamic dissipations of the P-CPAL circuits with dual-threshold CMOS and gate-length biasing techniques are reduced greatly compared with the normal P-CPAL circuits.