Oppression
Oppression is one of the major themes that features at length in the novel. This theme is exemplified in various incidents that occur throughout the novel. One of the first few instances of this would be when Luo Ji's adamant refusal to be part of the Wallfacer program is not looked upon kindly by the organization in power (i.e. the UN) and he is oppressed by having his wife kidnapped from him. The premise of the novel is also one that centers heavily on oppression. Much of the driving force behind the events of the novel is the oppression of the human race by the Trisolarians. This oppression manifests itself in the constant surveillance by the Trisolarians and the ever looming threat of extinction.
Conflict and Consensus
Another major theme in the novel is that of conflict and consensus. In the novel, there is constantly a conflict going on and consensus is not always reached. Primarily, the main conflict in the novel occurs between the Trisolarians and the human race, through the proxy of Luo Ji. Ultimately though, this conflict is resolved due to Luo Ji's wit and a consensus is eventually reached between the Trisolarians and the human race.
Love
One of the minor themes in the novel is that of love. While not featured significantly in the novel, the importance of this theme cannot be understated. Love acts as a motivating factor or many of the actions undertaken by the protagonist. Luo Ji is initially driven to act by his love for his wife and child. Later on, his love for the human race (albeit tinged with disillusionment and disenfranchisement) is what drives him to repel the Trisolarian invasion successfully.
