Extensive　studies　on　incremental　maintenance　of　materialized　views　for　relational　data　source　have　proved　that　incremental　maintenance　of　materialized　views　can　bring　a　lot　of　performance　benefits.　It　is　still　a　challenge　for　incremental　maintenance　of　materialized　views　for　semi-structured　data　source　although　some　works　have　put　their　emphasis　on　it.　This　paper　proposes　a　novel　approach　to　implement　incremental　maintenance　of　materialized　XPath　view　based　on　the　theory　of　incremental　computation　and　program　transformation.　The　characteristics　of　this　approach　are:　(1)　The　incremental　maintenance　program　is　created　automatically　for　a　specific　materialized　XPath　view　and　a　specific　update　in　XML　data　source;　(2)　Program　transformation　technique　is　used　to　create　incremental　maintenance　program;　(3)　The　incremental　maintenance　program　is　written　in　XQuery　language　and　can　be　executed　by　any　XQuery　engine;　(4)　The　only　auxiliary　data　to　maintain　the　materialized　XPath　view　is　the　incremental　maintenance　program　and　its　size　cost　is　very　small.　Experiments　have　shown　that　this　approach　outperforms　view　recomputation.