A theoretical ahalysis of laser diode end-pumped intracavity frequency-doubled lasers is presented. It is shown that the output SHG power depends mainly on the pumping beam waist,cavity parameters and the round trip loss of the cavity. An experimental result of a LD pumped Nd: YVO4 laser is reported. The second-harmonic output power at 532 nm is 153.9 mW at an incident pump power of 668.7 mW, corresponding to an optical efficiency of 23%.