Packet-based　transmission　of　data　over　a　network　with　limited　bandwidth　would　result　in　lost　data.　The　H2　output　feedback　control　problem　for　a　class　of　networked　control　system　with　both　measurement　data　and　control　data　missing　simultaneously　is　considered　in　this　paper.　The　packet　loss　is　modeled　as　a　Bernoulli　distributed　white　sequence　with　a　known　conditional　probability　distribution.　A　sufficient　condition　for　the　existence　of　a　dynamic　output　feedback　controller　is　present　via　matrix　inequalities,　such　that　the　closed-loop　system　is　exponentially　mean-square　stable　and　a　prescribed　H2　performance　is　guaranteed.　The　sequentially　linear　programming　matrix　method　(SLPMM)　is　used　to　solve　the　matrix　inequalities.　Numerical　example　is　provided　to　demonstrate　the　feasibility　of　the　proposed　condition　and　the　controller　design　procedure.