It is still an open problem to determine the conjugacy classes of Borel subalgebras of non-classical type Lie algebras. In this paper, we prove that there are at least 2 conjugacy classes of Borel subalgebras as well as maximal triangulable subalgebras of restricted Cartan type Lie algebras of type W, S and H. We are particularly interested in maximal triangulable subalgebras of W(n) under some conditions which is called B-subalgebras (Definition 3.1). We classify the conjugacy classes of B-subalgebras for W(n) and determine their representatives. This paper and its sequel [Z. Lin, K. Ou and B. Shu, Geometric Setting of Jacobson-Witt Algebras, preprint] attempt to establish both algebraic and geometric setting for geometric representation theory of W(n).
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