At　present,　1.5　μm　LD　pumped　Er-glass　passively　Q-switched　micro-laser　is　a　popular　research　direction　in　military　laser　ranging.　Achieving　high　repetition　rate　and　single　pulse　energy　are　very　important　indicators.　In　this　paper,　a　kHz　erbium-ytterbium　co-doped　phosphate　glass　passively　Qswitched　microchip　laser　for　laser　ranging　was　reported.　The　laser　was　pumped　by　a　single　diode　with　a　center　wavelength　of　940　nm　and　erbium-ytterbium　co-doped　phosphate　glass(Er3+,　Yb3+:　glass)　as　the　gain　medium,　CO2+:　MgAl2O4　(CO:　MALO)　as　the　saturable　absorber.　By　analyzing　the　influence　of　the　pump　spot　radius　on　the　mode-matching,　the　pump　spot　radius　was　optimized.　The　effects　of　the　initial　transmittance　(T0)　of　saturable　absorber　and　the　reflectance　R　of　output　mirror　on　the　output　laser　parameters　were　experimentally　analyzed.　In　the　final　pre-pumping　experiment,　a　Q-switched　pulse　was　achieved,　with　repetition　frequency　of　1　kHz,　wavelength　of　1　535　nm,　single　pulse　energy　of　40　μJ,　pulse　width　of　5.09　ns,　peak　power　of　7.89　kW　and　beam　quality　of　1.4.　©　2018,　Editorial　Board　of　Journal　of　Infrared　and　Laser　Engineering.　All　right　reserved.