ZrNp4　could　react　at　room　temperature　with　surface　hydroxy　groups　of　MCM-41　molecular　sieve,　with　formation　of　an　organo-zirconium　complex　(≡Si　-　O)2Np2　on　the　surface.　The　method　of　preparation　of　the　surface　complex　is　presented.　The　effects　of　the　reaction　temperature,　of　the　sublimation　temperature　of　ZrNp4　and　of　the　dehydration　temperature　of　MCM-41　on　the　preparation　were　investigated.　The　composition　and　structure　of　the　surface　complex　were　characterized　by　FTIR,　solid　state　MAS　NMR　and　chemical　probe　reaction.