The nonlinear plasma density waves in a low-β cylindrical symmetry magnetic tube are discussed. The results show that: (1) if |(a/M
2-1)E
0| < 1 or a/M
2> l, |(a/M
2-1)E
0| > 1 and G
m > 1 + |(a/M
2-1)E
0|, there exist periodic waves; (where a = Ti/Te+ 1, Ti and 7% are the ion and electron thermal energies respectively, Mis the ratio of phase velocity of wave and ion acoustic velocity, E
0 isinitial electrical field, (G
m=√a/M
2exp(1-a/M
2)/(2a/M
2)). (2) if |(a/M
2-1)E
0| = 1 and G
m≤2, there exist shock waves; (3) if a/M
2 > 1, | (a/M
2-1)E
0| = 1 and G
m>2, there exist hollow solitons; (4) if a/M
2< 1, |(a/M
2-1)E
0|≥1 and G
m> 1 + |(a/M
2-1)E
0| or |(a/M
2-1)E
0| > 1 and G
m≤ 1+|(a/M
2-l)E
0|, there exist raised solitons. The amplitude of waves is discussed also.