The basis of liturgies used by all Malankara Syrian Christian Churches of Eastern origin is the Liturgy of St. James the Just. James was the Bishop of Jerusalem soon after the formation of the Church on the Pentecost. For more details visit http://marthoma.in/faith-sacraments/liturgy/
Here are few Powerpoint presentations and a printable version of Mar Thoma Church liturgies
Holy Communion
Passion Week