  The spectral theory of Laplacian tensor is an important tool for revealing
some important properties of a hypergraph. It is meaningful to compute all
Laplacian H-eigenvalues for some special $k$-uniform hypergraphs. For an
odd-uniform loose path of length three, the Laplacian H-spectrum has been
studied. However, all Laplacian H-eigenvalues of the class of loose paths have
not been found out. In this paper, we compute all Laplacian H-eigenvalues for
the class of loose paths. We show that the number of Laplacian H-eigenvalues of
an odd(even)-uniform loose path with length three is $7$($14$). Some numerical
results are given to show the efficiency of our method. Especially, the
numerical results show that its Laplacian H-spectrum converges to
$\{0,1,1.5,2\}$ when $k$ goes to infinity. Finally, we establish convergence
analysis for a part of the conclusion and also present a conjecture.
