In order to solve the problem of beam quality decline induced by asymmetrical pumping and cooling of traditional conductive cooling lasers, one laser pumping structure with symmetrical pumping and cooling was adopted. Combined with direct coating film on laser rod end face, one miniature conductive cooling laser was designed and tested experimentally. The results show that, the output laser energy is more than 100mJ, with the laser pulse repetition of 5Hz. The laser pulse width is 9.18ns, and the energy instability is better than 8%. The laser works steadily under high and low temperature or vibration circumstance. The symmetrically-pumped conductive cooling laser has advantages of simple structure, high energy and good beam quality. It is very suitable for miniature airborne laser rangefinders.