La1-xSrxMnO3　(LSMO)/TiO2　heterostructures　have　been　synthesized　by　the　rf　magnetron　sputtering　and　exhibit　excellent　rectifying　properties.　The　diffusion　potentials　increase　with　increasing　Sr　concentration　and　decrease　with　the　increase　of　temperature,　which　is　attributed　to　modulating　the　interfacial　electronic　structure　of　La1-xSrxMnO3/TiO2　heterostructure　while　changing　temperatures.　It　is　worth　noting　that　the　metal-insulator　(M-I)　transition　of　LSMO　can　also　be　observed　in　heterostructures　and　the　increased　sheet　resistance　of　heterostructures　at　low　temperatures　is　related　to　the　introduction　of　TiO2.　(c)　2006　American　Institute　of　Physics.